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// * distributed with this work for additional information regarding copyright ownership.  The ASF licenses this file        *
// * to you under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance            *
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// *                                                                                                                         *
// *  http://www.apache.org/licenses/LICENSE-2.0                                                                             *
// *                                                                                                                         *
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package org.apache.juneau.rest;

import java.io.*;

import org.apache.juneau.encoders.*;

/**
 * A wrapped {@link PrintWriter} with an added <code>finish()</code> method.
 */
public class FinishablePrintWriter extends PrintWriter implements Finishable {

	final Finishable f;

	FinishablePrintWriter(OutputStream out, String characterEncoding) throws IOException {
		super(new OutputStreamWriter(out, characterEncoding));
		f = (out instanceof Finishable ? (Finishable)out : null);
	}


	/**
	 * Calls {@link Finishable#finish()} on the underlying output stream.
	 * 
	 * <p>
	 * A no-op if the underlying output stream does not implement the {@link Finishable} interface.
	 */
	@Override /* Finishable */
	public void finish() throws IOException {
		if (f != null)
			f.finish();
	}
}
